Dark region of quantum well excitons in stress-induced potentials

In the presentation, the authors will consider evidence that this dark region is an ensemble of dark excitons, lying lower in energy than that of the bright excitons, and will discuss how this new phase transition depends on various experimental parameters, such as, the strength of the potential, the temperature and the particle density. As shown in the paper, the phase transition occurs only at low temperatures, strong confinement, and high densities, and this might imply the presence of a dark excitonic condensate. Further testing of the dark population is currently underway.